As many as nine vehicles were involved in a collision on the southbound San Diego (405) Freeway in West Los Angeles at 6 this morning, prompting a partial closure of the vital artery, but no injuries were reported.

The crash was south of Wilshire Boulevard, said California Highway Patrol Officer Patrick Kimball.

Officers closed the carpool lane and the No. 1 lane while crews worked to clear the scene, Kimball said. The cause of the accident was under investigation.